CN104581669A - Vehicle-mounted self-organizing network based emergent message transmission method - Google Patents
Vehicle-mounted self-organizing network based emergent message transmission method Download PDFInfo
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- CN104581669A CN104581669A CN201410826695.9A CN201410826695A CN104581669A CN 104581669 A CN104581669 A CN 104581669A CN 201410826695 A CN201410826695 A CN 201410826695A CN 104581669 A CN104581669 A CN 104581669A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
Abstract
The invention discloses a vehicle-mounted self-organizing network based emergent message transmission method in order to realize that redundant IP (internet protocol) layer and transmission layer functions of TCP/IP (transmission control protocol/ internet protocol) are avoided and processing for ordinary messages by the TCP/IP is not influenced when a vehicle-mounted self-organizing network based vehicle transmits emergent messages. The method comprises steps as follows: 1, an emergent message generation stage; 2, an emergent message transmission stage; 3, an emergent message receiving stage: messages are transferred to a TCP/IP network layer and an emergent message processing module when received by a network interface layer of a surrounding vehicle, the TCP/IP network layer abandons messages with the length smaller than 20 bytes and processes ordinary messages with the length larger than or equal to 20 bytes, and the emergent message processing module abandons the messages with the length larger than or equal to 20 bytes and processes the emergent messages with the length smaller than 20 bytes; when the emergent message processing module receives the emergent messages, corresponding system processes seize CPU (central processing unit) resources, and the emergent messages related with security are subjected to priority processing.
Description
Technical field
The present invention relates to a kind of message transmitting method of associated vehicle driving safety, or rather, the present invention relates to a kind of transmission method of the urgent messages based on vehicular ad hoc networking.
Background technology
Vehicular ad hoc network is namely by the vehicle special short distance communication network of a distributed AC servo system of the vehicle on road and vehicle and vehicle and road side facility dynamic construction, the important goal that vehicular ad hoc network builds is the driving safety improving vehicle, make to share security related information timely between vehicle, therefore require higher to the transmission of security-related urgent messages and the promptness of reception.
In recent years, the research about vehicular ad hoc network protocol stack and routing algorithm is many, but specializes in the few of urgent messages transmission, the ICP/IP protocol method that existing file transmitting method is mainly traditional.ICP/IP protocol adopts the modularization protocol stack design thought of layering, is mainly divided into application layer, transport layer, network layer and network interface layer.Every one deck completes part of functions during data packet transmission, and packet is packed successively from top to bottom according to protocol stack and sent.But send at vehicular ad hoc network in the application of urgent messages, ICP/IP protocol comes with some shortcomings, and is mainly manifested in:
The transport layer of 1.TCP/IP agreement and IP layer are before being put into network interface layer transmission by application layer message, needing packs layer by layer to data just may to relate to parsing to data and copy in (adding header) this process.For urgent messages, be no matter parsing, the copy of data, or transport layer and the necessary packing of IP layer, all can improve the transmission delay of urgent messages.
2., for IP layer, IP layer mainly adds IP header and finds suitable route by different IP addresses and by Packet Generation to the terminal of specifying.And in vehicular ad hoc network, as long as security-related urgent messages is transferred to the vehicle of certain limit around accident vehicle, so take the mode of broadcast the most suitable.And In-vehicle networking adopts 802.11p home control network communication protocol, and effective transmission range of this agreement is 300 meters, and the vehicle range that will transmit for urgent messages is enough.From this angle above, the IP layer function of ICP/IP protocol is unnecessary for urgent messages transmission, and it can increase the transmission time of urgent messages.
3., for transport layer, transport layer is mainly added transport layer header and is realized connection control (transmitting, error control, flow control) by transport layer header.And in vehicular ad hoc network, the urgent messages that safety is relevant does not need too many application process, accident vehicle can continuous broadcasting emergency message towards periphery before accident terminates.Therefore, the function of transport layer is unnecessary for the transmission of urgent messages, and it adds the transmission delay of urgent messages on the contrary.
Described by above, when can find out the urgent messages that transmission security is relevant in vehicular ad hoc network, the transport layer of traditional ICP/IP protocol and IP layer function are not only not necessary, and the process in this is two-layer also can increase the transmission delay of urgent messages.
Summary of the invention
Technical problem to be solved by this invention is that the vehicle in vehicular ad hoc network avoids the unnecessary IP layer of ICP/IP protocol and transport layer functionality when transmitting urgent messages, add urgent messages processing module simultaneously thus do not affect the problem of ICP/IP protocol for the process of common message, providing a kind of transmission method of the urgent messages based on vehicular ad hoc networking.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize: the described urgent messages transmission method based on vehicular ad hoc networking comprises the steps:
1. urgent messages produces the stage:
Urgent messages processing module produces urgent messages when vehicle generation emergency;
2. urgent messages transmission phase:
Urgent messages processing module is by the urgent messages tissue of generation and send;
3. urgent messages receives the stage:
Urgent messages processing module receives urgent messages and processes.
Urgent messages processing module described in technical scheme produces urgent messages and refers to when vehicle generation emergency:
Vehicle have an accident or other emergencies time, the system process of the urgent messages processing module in onboard system is seized cpu resource and is produced corresponding urgent messages fast, or calls urgent messages processing module generation urgent messages by the consumer process having authority.
Urgent messages processing module described in technical scheme by the urgent messages tissue of generation and send refer to:
The urgent messages that urgent messages processing module organization need sends, add necessary positional information and urgent messages type, as: vehicle collision, ambulance, collaborative crashproof, the length of urgent messages to be organized within 20 bytes, because the effective length of IP message is more than or equal to 20 bytes, the network layer of urgent messages processing module and ICP/IP protocol can distinguish the type of message by the length of message, then the urgent messages organized directly is given network interface layer by urgent messages processing module, the vehicle of the effective range being sent to 802.11p home control network communication protocol by the mode of broadcast that is in 300 meters.
Urgent messages processing module described in technical scheme receives urgent messages and the step of process is as follows:
(1) according to the length information of urgent messages, whether what the judgement of urgent messages processing module received is urgent messages; The type of message is not judged when the network interface layer of surrounding vehicles receives message, but message is given respectively network layer and the urgent messages processing module of ICP/IP protocol, the network layer of ICP/IP protocol directly abandons length and is less than the message of 20 bytes and treated length is more than or equal to the common message of 20 bytes, and urgent messages processing module directly abandons length and is more than or equal to the message of 20 bytes and treated length is less than the urgent messages of 20 bytes;
(2) when urgent messages processing module receives urgent messages, corresponding system process seizes cpu resource, the urgent messages that priority treatment safety is relevant.
Compared with prior art the invention has the beneficial effects as follows:
1. the urgent messages transmission method based on vehicular ad hoc networking of the present invention is when transmitting the urgent messages of vehicular ad hoc network, can cross the transport layer of ICP/IP protocol and the packing process of IP layer;
2. the urgent messages transmission method based on vehicular ad hoc networking of the present invention uses special system kernel resume module urgent messages can seize CPU easily simultaneously, saves the time of process queue.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated:
Fig. 1 is the structured flowchart of the protocol model of the urgent messages transmission method based on vehicular ad hoc networking of the present invention;
Fig. 2 is the structured flowchart of the urgent messages form of the urgent messages transmission method based on vehicular ad hoc networking of the present invention;
Fig. 3 is the FB(flow block) of the urgent messages transmission method based on vehicular ad hoc networking of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is explained in detail:
Consult Fig. 1, urgent messages transmission method based on vehicular ad hoc networking of the present invention with the addition of a urgent messages processing module on original ICP/IP protocol model basis of onboard system (mostly being linux system), the IP layer co-operation of this module and ICP/IP protocol is on network interface layer, and IP layer and urgent messages processing module use consolidated network interface layer to send and receive data.
Urgent messages processing module comprises with lower unit:
1. urgent messages generation unit
For have an accident at vehicle or other emergencies time, the system process calling urgent messages processing module in onboard system seizes cpu resource, the corresponding urgent messages of quick generation also gives urgent messages transmitting element, or calls this system process generation urgent messages by the consumer process having authority and give urgent messages transmitting element;
2. urgent messages transmitting element
For the urgent messages that organization need sends, coal addition position information and urgent messages type, and the urgent messages organized directly is given network interface layer transmission;
3. urgent messages receiving element
For:
1) according to message length information, whether what judgement received is urgent messages;
2) if what receive is urgent messages, then the system process calling urgent messages processing module seizes cpu resource, this urgent messages of priority treatment.
Consult Fig. 2, urgent messages transmission method based on vehicular ad hoc networking of the present invention is when organizing urgent messages, in urgent messages form, type of message field takies 16 (2 bytes), this type of message field mainly distinguishes the type (alarm after accident, vehicle are worked in coordination with crashproof, intersection and worked in coordination with crashproof etc.) of the emergency management of vehicle representated by urgent messages, and 16 can represent 65535 kinds of different types.Retain position and be used for later possible expanded application, the positional information of the main store car of data division (maximum 15 bytes).The length of this urgent messages is the longest is 19 bytes, and the effective length of IP message is at least 20 bytes, and the length so just by message distinguishes different type of messages.
Consult Fig. 3, adopt the step of urgent messages transmission method to urgent messages transmission and reception based on vehicular ad hoc networking of the present invention as follows:
1. urgent messages produces the stage:
Urgent messages processing module produces urgent messages when vehicle generation emergency; Vehicle have an accident or other emergencies time, the system process of the urgent messages processing module in onboard system is seized cpu resource and is produced corresponding urgent messages fast, or calls urgent messages processing module generation urgent messages by the consumer process having authority;
2. urgent messages transmission phase:
Urgent messages processing module is by the urgent messages tissue of generation and send; The urgent messages that urgent messages processing module organization need sends, add necessary positional information and the (as: vehicle collision of urgent messages type, ambulance, collaborative crashproof etc.), the length of urgent messages to be organized within 20 bytes, because the effective length of IP message is more than or equal to 20 bytes, the network layer of urgent messages processing module and ICP/IP protocol can distinguish the type of message by the length of message.Directly give network interface layer by the urgent messages organized, be sent to the vehicle in the effective range (300 meters) of 802.11p home control network communication protocol by the mode of broadcast;
3. urgent messages receives the stage:
Urgent messages processing module receives urgent messages and processes.
(1) according to the length information of urgent messages, whether what the judgement of urgent messages processing module received is urgent messages.The type of message is not judged when the network interface layer of surrounding vehicles receives message, but message is given respectively network layer and the urgent messages processing module of ICP/IP protocol, the network layer of ICP/IP protocol directly abandons length and is less than the message of 20 bytes and treated length is more than or equal to the common message of 20 bytes, and urgent messages processing module directly abandons length and is more than or equal to the message of 20 bytes and treated length is less than the urgent messages of 20 bytes;
(2) when urgent messages processing module receives urgent messages, corresponding system process seizes cpu resource, the urgent messages that priority treatment safety is relevant.
Embodiment:
For Changchun, when supposing car accident occurs on satellite square, Changchun, owing to being subject to the triggering of external hardware, the system process that in accident vehicle onboard system, the urgent messages generation unit of urgent messages processing module calls urgent messages processing module seizes cpu resource, the corresponding urgent messages of quick generation, and give urgent messages transmitting element by this urgent messages, or produced urgent messages by the consumer process having authority to call this system process and give urgent messages transmitting element.
The positional information " satellite square " of accident vehicle is joined " data " field of urgent messages by urgent messages transmitting element, takies 8 bytes; Here use " 0000000000000001 " to represent the accident pattern of car accident, accident pattern " 0000000000000001 " is joined " type of message " field of urgent messages, take 2 bytes; Suppose not have " reservation position " field of other important informations then urgent messages for empty, this urgent messages takies 10 bytes like this, then give network interface layer by the urgent messages organized, be sent to the vehicle in the effective range (300 meters) of 802.11p home control network communication protocol by the mode of broadcast;
When the network interface layer of surrounding vehicles receives this urgent messages, this urgent messages is given respectively the network layer of ICP/IP protocol and the urgent messages receiving element of urgent messages processing module, the network layer of ICP/IP protocol directly abandons this urgent messages, because the length of message is less than 20 bytes, and according to message length, the urgent messages receiving element of urgent messages processing module judges that this message is urgent messages, so the system process calling urgent messages processing module seizes cpu resource, this urgent messages of priority treatment.
Claims (4)
1. based on the urgent messages transmission method at vehicular ad hoc networking, it is characterized in that, the described urgent messages transmission method based on vehicular ad hoc networking comprises the steps:
1) urgent messages produces the stage:
Urgent messages processing module produces urgent messages when vehicle generation emergency;
2) urgent messages transmission phase:
Urgent messages processing module is by the urgent messages tissue of generation and send;
3) urgent messages receives the stage:
Urgent messages processing module receives urgent messages and processes.
2. according to the urgent messages transmission method based on vehicular ad hoc networking according to claim 1, it is characterized in that, described urgent messages processing module produces urgent messages and refers to when vehicle generation emergency:
Vehicle have an accident or other emergencies time, the system process of the urgent messages processing module in onboard system is seized cpu resource and is produced corresponding urgent messages fast, or calls urgent messages processing module generation urgent messages by the consumer process having authority.
3., according to the urgent messages transmission method based on vehicular ad hoc networking according to claim 1, it is characterized in that, described urgent messages processing module by the urgent messages tissue of generation and send refer to:
The urgent messages that urgent messages processing module organization need sends, add necessary positional information and urgent messages type, as: vehicle collision, ambulance, collaborative crashproof, the length of urgent messages to be organized within 20 bytes, because the effective length of IP message is more than or equal to 20 bytes, the network layer of urgent messages processing module and ICP/IP protocol can distinguish the type of message by the length of message, then the urgent messages organized directly is given network interface layer by urgent messages processing module, the vehicle of the effective range being sent to 802.11p home control network communication protocol by the mode of broadcast that is in 300 meters.
4. according to the urgent messages transmission method based on vehicular ad hoc networking according to claim 1, it is characterized in that, described urgent messages processing module receives urgent messages and the step of process is as follows:
(1) according to the length information of urgent messages, whether what the judgement of urgent messages processing module received is urgent messages; The type of message is not judged when the network interface layer of surrounding vehicles receives message, but message is given respectively network layer and the urgent messages processing module of ICP/IP protocol, the network layer of ICP/IP protocol directly abandons length and is less than the message of 20 bytes and treated length is more than or equal to the common message of 20 bytes, and urgent messages processing module directly abandons length and is more than or equal to the message of 20 bytes and treated length is less than the urgent messages of 20 bytes;
(2) when urgent messages processing module receives urgent messages, corresponding system process seizes cpu resource, the urgent messages that priority treatment safety is relevant.
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